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                <h1 id="Spring整合MyBatis"><a href="#Spring整合MyBatis" class="headerlink" title="Spring整合MyBatis"></a>Spring整合MyBatis</h1><p><a target="_blank" rel="noopener" href="https://www.bilibili.com/video/BV11p4y1S77o">https://www.bilibili.com/video/BV11p4y1S77o</a></p>
<p><strong>Spring:</strong></p>
<blockquote>
<p>Spring是一个开源框架，Spring是于2003 年兴起的一个轻量级的Java 开发框架，由Rod Johnson 在其著作Expert One-On-One J2EE Development and Design中阐述的部分理念和原型衍生而来。它是为了解决企业应用开发的复杂性而创建的。框架的主要优势之一就是其分层架构，分层架构允许使用者选择使用哪一个组件，同时为 J2EE 应用程序开发提供集成的框架。Spring使用基本的JavaBean来完成以前只可能由EJB完成的事情。然而，Spring的用途不仅限于服务器端的开发。从简单性、可测试性和松耦合的角度而言，任何Java应用都可以从Spring中受益。Spring的核心是控制反转（IOC）和面向切面（AOP）。简单来说，Spring是一个分层的JavaSE/EE full-stack(一站式) 轻量级开源框架</p>
</blockquote>
<p><strong>Spring的优点</strong>：</p>
<blockquote>
<ol>
<li> <strong>方便解耦，简化开发 （高内聚低耦合）</strong>                                                                                                                              Spring就是一个大工厂（容器）， Spring工厂是用于生成bean，可以将所有对象创建和依赖关系维护，交给Spring管理                                               </li>
<li><strong>AOP编程的支持</strong><br> ​    Spring提供面向切面编程，可以方便的实现对程序进行权限拦截、运行监控等功能</li>
<li> <strong>声明式事务的支持</strong>                                                                                                                                                               只需要通过配置就可以完成对事务的管理，而无需手动编程</li>
<li><strong>方便程序的测试</strong> <pre><code> Spring对Junit4支持，可以通过注解方便的测试Spring程序</code></pre>
</li>
<li><strong>方便集成各种优秀框架</strong> <pre><code> Spring不排斥各种优秀的开源框架，其内部提供了对各种优秀框架（如：Struts、Hibernate、MyBatis等）的直接支持，方便整合其他框架</code></pre>
</li>
<li><strong>降低JavaEE API的使用难度</strong> <pre><code> Spring 对JavaEE开发中非常难用的一些API（JDBC、JavaMail、远程调用等），都提供了封装，使这些API应用难度大大降低</code></pre>
</li>
</ol>
</blockquote>
<p><strong>Spring的控制反转（IOC）：</strong></p>
<blockquote>
<p>​    Inversion of Control 又称为 ==依赖注入 (DI)==  Dependency Injection 把对象的创建和方法的调用的==控制权==(反转)交由给==容器管理==，由容器控制程序之间的==依赖关系==,IOC就是一个==生产和管理bean==的容器就行了，原来需要在调用类中==new==的东西，现在都是通过容器生成同时，要是产生的是单例的bean，他还可以给管理bean的生命周期</p>
</blockquote>
<p><strong>IOC理解：</strong></p>
<blockquote>
<p>它并不是一种技术实现，而是一种==设计思想==。在任何一个有实际开发意义的程序项目中，我们会使用很多类来描述它们特有的功能，并且通过类与类之间的相互协作来完成特定的业务逻辑。这个时候，每个类都需要负责管理与自己有交互的类的引用和依赖，代码将会变的异常难以维护和极度的高耦合。而IOC的出现正是用来解决这个问题，我们==通过IOC将这些相互依赖对象的创建、协调工作交给Spring容器去处理==，每个对象只需要关注其自身的业务逻辑关系就可以了。在这样的角度上来看，获得依赖的对象的方式，进行了反转，变成了由==spring容器控制对象如何获取外部资源==（包括其他对象和文件资料等等）</p>
</blockquote>
<p><strong>IOC和DI的区别：</strong></p>
<blockquote>
<ol>
<li>  IOC：控制反转，把==创建对象==交给Spring进行配置</li>
<li>  DI：   依赖注入，向类里面的==属性==中==赋值==</li>
</ol>
</blockquote>
<p><strong>Spring的面向切面编程（AOP）：</strong></p>
<blockquote>
<p>将程序中的==交叉业务逻辑==（比如安全，日志，事务等），封装成一个==切面==，然后==注入到目标对象==（具体业务逻辑）中去。<br>比如：<br>很多方法可能会抛异常，你要记录这个异常到日志中去，可以写个拦截器类，在这个类中记录日志，在spring.xml中配置一个对这些要记录日志的方法的aop拦截器在这个方法执行后调用这个拦截器，记录日志。这样就不用每次抛异常都要手动记录日志。 spring的事务管理用到的就是aop这样也可以提高程序的内聚性</p>
</blockquote>
<p><strong>Spring常用注解</strong></p>
<blockquote>
<p><strong>1、声明bean的注解</strong></p>
<p>@Component 组件，没有明确的角色</p>
<p>@Service 在业务逻辑层使用（service层）</p>
<p>@Repository 在数据访问层使用（dao层）</p>
<p>@Controller 在展现层使用，控制器的声明（C）</p>
<p><strong>2、注入bean的注解</strong></p>
<p>@Autowired：由Spring提供</p>
<p>@Inject：由JSR-330提供</p>
<p>@Resource：由JSR-250提供</p>
<p>都可以注解在set方法和属性上，推荐注解在属性上（一目了然，少写代码）。</p>
<p><strong>3、java配置类相关注解</strong></p>
<p>@Configuration 声明当前类为配置类，相当于xml形式的Spring配置（类上）</p>
<p>@Bean 注解在方法上，声明当前方法的返回值为一个bean，替代xml中的方式（方法上）</p>
<p>@Configuration 声明当前类为配置类，其中内部组合了@Component注解，表明这个类是一个bean（类上）</p>
<p>@ComponentScan 用于对Component进行扫描，相当于xml中的（类上）</p>
<p>@WishlyConfiguration 为@Configuration与@ComponentScan的组合注解，可以替代这两个注解</p>
<p><strong>4、切面（AOP）相关注解</strong></p>
<p>Spring支持AspectJ的注解式切面编程。</p>
<p>@Aspect 声明一个切面（类上）<br>使用@After、@Before、@Around定义建言（advice），可直接将拦截规则（切点）作为参数。</p>
<p>@After 在方法执行之后执行（方法上）<br>@Before 在方法执行之前执行（方法上）<br>@Around 在方法执行之前与之后执行（方法上）</p>
<p>@PointCut 声明切点<br>在java配置类中使用@EnableAspectJAutoProxy注解开启Spring对AspectJ代理的支持（类上）</p>
<p><strong>5、@Bean的属性支持</strong></p>
<p>@Scope 设置Spring容器如何新建Bean实例（方法上，得有@Bean）<br>其设置类型包括：</p>
<p>Singleton （单例,一个Spring容器中只有一个bean实例，默认模式）,<br>Protetype （每次调用新建一个bean）,<br>Request （web项目中，给每个http request新建一个bean）,<br>Session （web项目中，给每个http session新建一个bean）,<br>GlobalSession（给每一个 global http session新建一个Bean实例）</p>
<p>@StepScope 在Spring Batch中还有涉及</p>
<p>@PostConstruct 由JSR-250提供，在构造函数执行完之后执行，等价于xml配置文件中bean的initMethod</p>
<p>@PreDestory 由JSR-250提供，在Bean销毁之前执行，等价于xml配置文件中bean的destroyMethod</p>
<p><strong>6、@Value注解</strong></p>
</blockquote>
<p><strong>Bean的作用域</strong></p>
<blockquote>
<p>Singleton:单例的,每次创建的bean都是相同的</p>
<p>Prototype:多例的,每次创建的bean都是不一样的</p>
<p>request:在一次请求中的bean都是相同的</p>
<p>session:</p>
<p>global-session:</p>
</blockquote>
<p><strong>Bean的自动装配方式</strong></p>
<blockquote>
<p>ByName:</p>
<p>ByType:</p>
<p>no:</p>
<p>constructor:</p>
</blockquote>
<p><img src="/blog/2020/10/29/Spring%E6%95%B4%E5%90%88MyBatis/Spring%E6%95%B4%E5%90%88MyBatis/1599791915453.png" alt="1599791915453"></p>
<h2 id="步骤"><a href="#步骤" class="headerlink" title="步骤"></a>步骤</h2><ul>
<li>添加maven依赖</li>
</ul>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br><span class="line">50</span><br><span class="line">51</span><br><span class="line">52</span><br><span class="line">53</span><br><span class="line">54</span><br><span class="line">55</span><br><span class="line">56</span><br><span class="line">57</span><br><span class="line">58</span><br><span class="line">59</span><br><span class="line">60</span><br><span class="line">61</span><br><span class="line">62</span><br><span class="line">63</span><br><span class="line">64</span><br><span class="line">65</span><br><span class="line">66</span><br><span class="line">67</span><br><span class="line">68</span><br><span class="line">69</span><br><span class="line">70</span><br><span class="line">71</span><br><span class="line">72</span><br><span class="line">73</span><br><span class="line">74</span><br><span class="line">75</span><br><span class="line">76</span><br><span class="line">77</span><br><span class="line">78</span><br><span class="line">79</span><br><span class="line">80</span><br><span class="line">81</span><br><span class="line">82</span><br><span class="line">83</span><br><span class="line">84</span><br><span class="line">85</span><br><span class="line">86</span><br><span class="line">87</span><br><span class="line">88</span><br><span class="line">89</span><br><span class="line">90</span><br><span class="line">91</span><br><span class="line">92</span><br><span class="line">93</span><br><span class="line">94</span><br></pre></td><td class="code"><pre><span class="line"><span class="tag">&lt;<span class="name">properties</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">spring-version</span>&gt;</span>5.1.3.RELEASE<span class="tag">&lt;/<span class="name">spring-version</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">properties</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">dependencies</span>&gt;</span></span><br><span class="line">    <span class="comment">&lt;!--springmvc--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-webmvc<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>$&#123;spring-version&#125;<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--spring-jdbc--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-jdbc<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>$&#123;spring-version&#125;<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--spring aop--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-aop<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>$&#123;spring-version&#125;<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.springframework<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>spring-aspects<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>$&#123;spring-version&#125;<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--mybatis--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.mybatis<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>mybatis<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>3.4.5<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--mybatis整合spring--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.mybatis<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>mybatis-spring<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>1.3.2<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--mysql驱动--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>mysql<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>mysql-connector-java<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>8.0.13<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--数据源--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>commons-dbcp<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>commons-dbcp<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>1.4<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--jstl--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>jstl<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>jstl<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>1.2<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--Servlet--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>javax.servlet<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>javax.servlet-api<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>3.1.0<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--简化getter and setter--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>org.projectlombok<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>lombok<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>1.16.22<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--pageHelper实现分页--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>com.github.pagehelper<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>pagehelper<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>5.1.2<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line">    </span><br><span class="line">    <span class="tag">&lt;<span class="name">dependency</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">groupId</span>&gt;</span>junit<span class="tag">&lt;/<span class="name">groupId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">artifactId</span>&gt;</span>junit<span class="tag">&lt;/<span class="name">artifactId</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">version</span>&gt;</span>4.12<span class="tag">&lt;/<span class="name">version</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">scope</span>&gt;</span>compile<span class="tag">&lt;/<span class="name">scope</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">dependency</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">dependencies</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ul>
<li>创建项目结构</li>
</ul>
<p><img src="/blog/2020/10/29/Spring%E6%95%B4%E5%90%88MyBatis/Spring%E6%95%B4%E5%90%88MyBatis/1599642286339.png" alt="1599642286339"></p>
<ul>
<li>配置mybatis-config.xml</li>
</ul>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; ?&gt;</span></span><br><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">configuration</span></span></span><br><span class="line"><span class="meta">        <span class="meta-keyword">PUBLIC</span> <span class="meta-string">&quot;-//mybatis.org//DTD Config 3.0//EN&quot;</span></span></span><br><span class="line"><span class="meta">        <span class="meta-string">&quot;http://mybatis.org/dtd/mybatis-3-config.dtd&quot;</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;<span class="name">configuration</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--日志--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">settings</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">setting</span> <span class="attr">name</span>=<span class="string">&quot;logImpl&quot;</span> <span class="attr">value</span>=<span class="string">&quot;STDOUT_LOGGING&quot;</span>/&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">settings</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--分页插件--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">typeAliases</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">package</span> <span class="attr">name</span>=<span class="string">&quot;com.changan.entity&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">package</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">typeAliases</span>&gt;</span></span><br><span class="line">    <span class="comment">&lt;!--下面的一些配置都是交给spring进行管理的,不需要在mybatis中进行配置--&gt;</span></span><br><span class="line">    <span class="comment">&lt;!--数据源--&gt;</span></span><br><span class="line">    <span class="comment">&lt;!--有哪些mapper.xml文件--&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">configuration</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ul>
<li>配置applicationContext.xml文件</li>
</ul>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br><span class="line">48</span><br><span class="line">49</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot;?&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">beans</span> <span class="attr">xmlns</span>=<span class="string">&quot;http://www.springframework.org/schema/beans&quot;</span></span></span><br><span class="line"><span class="tag">       <span class="attr">xmlns:xsi</span>=<span class="string">&quot;http://www.w3.org/2001/XMLSchema-instance&quot;</span></span></span><br><span class="line"><span class="tag">       <span class="attr">xmlns:context</span>=<span class="string">&quot;http://www.springframework.org/schema/context&quot;</span></span></span><br><span class="line"><span class="tag">       <span class="attr">xsi:schemaLocation</span>=<span class="string">&quot;http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context.xsd&quot;</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--1.引用数据源的属性文件--&gt;</span></span><br><span class="line">    <span class="comment">&lt;!--</span></span><br><span class="line"><span class="comment">        读取 db.properties 中的内容</span></span><br><span class="line"><span class="comment">        property-placeholder: 占位符</span></span><br><span class="line"><span class="comment">        location： 属性文件的位置</span></span><br><span class="line"><span class="comment">    --&gt;</span></span><br><span class="line">    <span class="comment">&lt;!--&lt;context:property-placeholder location=&quot;classpath:db.properties&quot;/&gt;--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;propertyPlaceholderConfigurer&quot;</span> <span class="attr">class</span>=<span class="string">&quot;org.springframework.beans.factory.config.PropertyPlaceholderConfigurer&quot;</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;locations&quot;</span> <span class="attr">value</span>=<span class="string">&quot;classpath:db.properties&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--2.配置数据源--&gt;</span></span><br><span class="line">    <span class="comment">&lt;!--获得数据库连接池对象，并交由 spring 统一管理 --&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;dataSource&quot;</span> <span class="attr">class</span>=<span class="string">&quot;org.apache.commons.dbcp.BasicDataSource&quot;</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;driverClassName&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;driverClassName&#125;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;url&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;url&#125;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;username&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;username&#125;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;password&quot;</span> <span class="attr">value</span>=<span class="string">&quot;$&#123;password&#125;&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--3.通过数据源获取SqlSessionFactory对象--&gt;</span></span><br><span class="line">    <span class="comment">&lt;!--创建对象的过程都要交给spring的ioc进行管理--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">bean</span> <span class="attr">id</span>=<span class="string">&quot;sqlSessionFactory&quot;</span> <span class="attr">class</span>=<span class="string">&quot;org.mybatis.spring.SqlSessionFactoryBean&quot;</span>&gt;</span></span><br><span class="line">        <span class="comment">&lt;!--指定sqlSessionFactory引用的数据源--&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;dataSource&quot;</span> <span class="attr">ref</span>=<span class="string">&quot;dataSource&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br><span class="line"></span><br><span class="line">        <span class="comment">&lt;!--&lt;property name=&quot;typeAliasesPackage&quot; value=&quot;com.changan.entity&quot;&gt;&lt;/property&gt;--&gt;</span></span><br><span class="line">        <span class="comment">&lt;!--指定mapper.xml的位置--&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;mapperLocations&quot;</span> <span class="attr">value</span>=<span class="string">&quot;classpath:/mapper/*Mapper.xml&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br><span class="line"></span><br><span class="line">        <span class="comment">&lt;!--mybatis的配置也需要交给spring容器进行管理--&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;configLocation&quot;</span> <span class="attr">value</span>=<span class="string">&quot;classpath:mybatis-config.xml&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--4.扫描所有的mapper并且注入到ioc容器--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">bean</span> <span class="attr">class</span>=<span class="string">&quot;org.mybatis.spring.mapper.MapperScannerConfigurer&quot;</span>&gt;</span></span><br><span class="line">        <span class="tag">&lt;<span class="name">property</span> <span class="attr">name</span>=<span class="string">&quot;basePackage&quot;</span> <span class="attr">value</span>=<span class="string">&quot;com.changan.mapper&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">property</span>&gt;</span></span><br><span class="line">    <span class="tag">&lt;/<span class="name">bean</span>&gt;</span></span><br><span class="line"></span><br><span class="line">    <span class="comment">&lt;!--5.扫描所有的注解--&gt;</span></span><br><span class="line">    <span class="tag">&lt;<span class="name">context:component-scan</span> <span class="attr">base-package</span>=<span class="string">&quot;com.changan&quot;</span>&gt;</span><span class="tag">&lt;/<span class="name">context:component-scan</span>&gt;</span></span><br><span class="line"></span><br><span class="line"><span class="tag">&lt;/<span class="name">beans</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ul>
<li>配置log4j.properties</li>
</ul>
<figure class="highlight properties"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">log4j.rootLogger</span>=<span class="string">DEBUG,A1</span></span><br><span class="line"></span><br><span class="line"><span class="meta">log4j.appender.A1</span>=<span class="string">org.apache.log4j.ConsoleAppender</span></span><br><span class="line"><span class="meta">log4j.appender.A1.layout</span>=<span class="string">org.apache.log4j.PatternLayout</span></span><br><span class="line"><span class="meta">log4j.appender.A1.layout.ConversionPattern</span>=<span class="string">%-d&#123;yyyy-MM-dd HH:mm:ss,SSS&#125; [%t] [%c]-[%p] %m%n</span></span><br></pre></td></tr></table></figure>

<ul>
<li>UserMapper.java</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">@Repository</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">interface</span> <span class="title">UserMapper</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="function">List&lt;User&gt; <span class="title">findAll</span><span class="params">()</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="function">User <span class="title">findById</span><span class="params">(Long id)</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">int</span> <span class="title">addUser</span><span class="params">(User user)</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">int</span> <span class="title">deleteUser</span><span class="params">(Long id)</span></span>;</span><br><span class="line"></span><br><span class="line">    <span class="function"><span class="keyword">int</span> <span class="title">updateUser</span><span class="params">(User user)</span></span>;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>

<ul>
<li>UserMapper</li>
</ul>
<figure class="highlight xml"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br></pre></td><td class="code"><pre><span class="line"><span class="meta">&lt;?xml version=&quot;1.0&quot; encoding=&quot;UTF-8&quot; ?&gt;</span></span><br><span class="line"><span class="meta">&lt;!DOCTYPE <span class="meta-keyword">mapper</span></span></span><br><span class="line"><span class="meta">  <span class="meta-keyword">PUBLIC</span> <span class="meta-string">&quot;-//mybatis.org//DTD Mapper 3.0//EN&quot;</span></span></span><br><span class="line"><span class="meta">  <span class="meta-string">&quot;http://mybatis.org/dtd/mybatis-3-mapper.dtd&quot;</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;<span class="name">mapper</span> <span class="attr">namespace</span>=<span class="string">&quot;com.changan.mapper.UserMapper&quot;</span>&gt;</span></span><br><span class="line">  <span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;findAll&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;User&quot;</span>&gt;</span></span><br><span class="line">    select * from user</span><br><span class="line">  <span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br><span class="line"></span><br><span class="line">  <span class="tag">&lt;<span class="name">select</span> <span class="attr">id</span>=<span class="string">&quot;findById&quot;</span> <span class="attr">resultType</span>=<span class="string">&quot;User&quot;</span>&gt;</span></span><br><span class="line">    select * from user where id = #&#123;id&#125;</span><br><span class="line">  <span class="tag">&lt;/<span class="name">select</span>&gt;</span></span><br><span class="line"></span><br><span class="line">  <span class="tag">&lt;<span class="name">insert</span> <span class="attr">id</span>=<span class="string">&quot;addUser&quot;</span>&gt;</span></span><br><span class="line">    INSERT INTO `mybatis`.`user`(`id`, `name`, `age`, `email`) VALUES (null, #&#123;name&#125;, #&#123;age&#125;, #&#123;email&#125;)</span><br><span class="line">  <span class="tag">&lt;/<span class="name">insert</span>&gt;</span></span><br><span class="line"></span><br><span class="line">  <span class="tag">&lt;<span class="name">update</span> <span class="attr">id</span>=<span class="string">&quot;updateUser&quot;</span>&gt;</span></span><br><span class="line">    UPDATE `mybatis`.`user` SET `name` = #&#123;name&#125;, `age` = #&#123;age&#125;, `email` = #&#123;email&#125; WHERE `id` = #&#123;id&#125;</span><br><span class="line">  <span class="tag">&lt;/<span class="name">update</span>&gt;</span></span><br><span class="line"></span><br><span class="line">  <span class="tag">&lt;<span class="name">delete</span> <span class="attr">id</span>=<span class="string">&quot;deleteUser&quot;</span>&gt;</span></span><br><span class="line">    delete from user where id = #&#123;id&#125;</span><br><span class="line">  <span class="tag">&lt;/<span class="name">delete</span>&gt;</span></span><br><span class="line"><span class="tag">&lt;/<span class="name">mapper</span>&gt;</span></span><br></pre></td></tr></table></figure>

<ul>
<li>测试</li>
</ul>
<figure class="highlight java"><table><tr><td class="gutter"><pre><span class="line">1</span><br><span class="line">2</span><br><span class="line">3</span><br><span class="line">4</span><br><span class="line">5</span><br><span class="line">6</span><br><span class="line">7</span><br><span class="line">8</span><br><span class="line">9</span><br><span class="line">10</span><br><span class="line">11</span><br><span class="line">12</span><br><span class="line">13</span><br><span class="line">14</span><br><span class="line">15</span><br><span class="line">16</span><br><span class="line">17</span><br><span class="line">18</span><br><span class="line">19</span><br><span class="line">20</span><br><span class="line">21</span><br><span class="line">22</span><br><span class="line">23</span><br><span class="line">24</span><br><span class="line">25</span><br><span class="line">26</span><br><span class="line">27</span><br><span class="line">28</span><br><span class="line">29</span><br><span class="line">30</span><br><span class="line">31</span><br><span class="line">32</span><br><span class="line">33</span><br><span class="line">34</span><br><span class="line">35</span><br><span class="line">36</span><br><span class="line">37</span><br><span class="line">38</span><br><span class="line">39</span><br><span class="line">40</span><br><span class="line">41</span><br><span class="line">42</span><br><span class="line">43</span><br><span class="line">44</span><br><span class="line">45</span><br><span class="line">46</span><br><span class="line">47</span><br></pre></td><td class="code"><pre><span class="line"><span class="keyword">package</span> com.changan.test;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> com.changan.entity.Student;</span><br><span class="line"><span class="keyword">import</span> com.changan.mapper.StudentMapper;</span><br><span class="line"><span class="keyword">import</span> com.changan.service.StudentService;</span><br><span class="line"><span class="keyword">import</span> org.apache.ibatis.session.SqlSession;</span><br><span class="line"><span class="keyword">import</span> org.apache.ibatis.session.SqlSessionFactory;</span><br><span class="line"><span class="keyword">import</span> org.junit.Test;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.ApplicationContext;</span><br><span class="line"><span class="keyword">import</span> org.springframework.context.support.ClassPathXmlApplicationContext;</span><br><span class="line"></span><br><span class="line"><span class="keyword">import</span> java.util.List;</span><br><span class="line"></span><br><span class="line"><span class="comment">/**</span></span><br><span class="line"><span class="comment"> * <span class="doctag">@author</span> NieChangan</span></span><br><span class="line"><span class="comment"> */</span></span><br><span class="line"><span class="keyword">public</span> <span class="class"><span class="keyword">class</span> <span class="title">StudentTest</span> </span>&#123;</span><br><span class="line"></span><br><span class="line">    <span class="comment">/*public static void main(String[] args) &#123;</span></span><br><span class="line"><span class="comment">        ApplicationContext applicationContext = new ClassPathXmlApplicationContext(&quot;applicationContext.xml&quot;);</span></span><br><span class="line"><span class="comment">        SqlSessionFactory sqlSessionFactory = (SqlSessionFactory)applicationContext.getBean(&quot;sqlSessionFactory&quot;);</span></span><br><span class="line"><span class="comment">        SqlSession sqlSession = sqlSessionFactory.openSession();</span></span><br><span class="line"><span class="comment">        StudentMapper mapper = sqlSession.getMapper(StudentMapper.class);</span></span><br><span class="line"><span class="comment">        List&lt;Student&gt; all = mapper.findAll();</span></span><br><span class="line"><span class="comment">        System.out.println(all.size());</span></span><br><span class="line"><span class="comment">    &#125;*/</span></span><br><span class="line"></span><br><span class="line">    <span class="meta">@Test</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">findAll</span><span class="params">()</span></span>&#123;</span><br><span class="line">        ApplicationContext applicationContext = <span class="keyword">new</span> ClassPathXmlApplicationContext(<span class="string">&quot;applicationContext.xml&quot;</span>);</span><br><span class="line">        StudentService studentService = (StudentService) applicationContext.getBean(<span class="string">&quot;studentService&quot;</span>);</span><br><span class="line">        List&lt;Student&gt; all = studentService.findAll();</span><br><span class="line">        System.out.println(all.size());</span><br><span class="line">    &#125;</span><br><span class="line"></span><br><span class="line">    <span class="meta">@Test</span></span><br><span class="line">    <span class="function"><span class="keyword">public</span> <span class="keyword">void</span> <span class="title">addUser</span><span class="params">()</span></span>&#123;</span><br><span class="line">        ApplicationContext applicationContext = <span class="keyword">new</span> ClassPathXmlApplicationContext(<span class="string">&quot;applicationContext.xml&quot;</span>);</span><br><span class="line">        StudentService studentService = (StudentService) applicationContext.getBean(<span class="string">&quot;studentService&quot;</span>);</span><br><span class="line">        Student student = <span class="keyword">new</span> Student();</span><br><span class="line">        student.setName(<span class="string">&quot;123123&quot;</span>);</span><br><span class="line">        student.setSex(<span class="string">&quot;男&quot;</span>);</span><br><span class="line">        student.setGradeId(<span class="number">1</span>);</span><br><span class="line">        <span class="keyword">int</span> i = studentService.addStudent(student);</span><br><span class="line">        System.out.println(i);</span><br><span class="line">    &#125;</span><br><span class="line">&#125;</span><br></pre></td></tr></table></figure>


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